Drill-press.



PATENTED JAN. 30, 1906.

A. E. NEWTON. DRILL PRESS. APPLIUATION FILED MAR.9. 1901.

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awfgz 6 l 0 T 9 E l B I H 0 4 3 S T N n A H .J H C D 41 N as: W $4 mm.. A p w P L M wa T wa m NLn n m A l.\ w 75% m P A ALBERT E. NEWTON, OF WORCESTER, MASSACHUSETTS.

DRILL-PRESS.

Specification of Letters Patent.

Patented Jan. 30, 1906.

Application filed March 9, 1901. Serial No. 50,422.

To all whom, it may concern:

Be it known that I, ALBERT E. NEWTON, a citizen of the United States, residing at Worcester, in the county of Worcester and Commonwealth of Massachusetts, have invented a new and useful Improvement in Drill-Presses, of which the following is a specification accompanied by drawings forming a part of the same, in which- Figure 1 represents a side elevation of a drilling-machine embodying my invention. Fig. 2 is an enlarged view of a portion of the drill-feeding mechanism, together with the stop motion for checking the feeding motion of the drill at a predetermined point. Fig. 3 is a central sectional view of the clutch on the pinion-shaft. Fig. 4 is a horizontal sectional view of the clutch on the feed-shaft on line 4, 41-, Fig. 2. Fig. 5 is a sectional view on line 5 5, Fig. 3. Fig. 6 is a detached view of the slotted hub on the feed-shaft. Fig. 7 is a top view of the sliding clutch-s indle, which is held concentrically with t e pinion-shaft; and Fig. 8 shows the bracket which receives the stop-motion lever, part of said bracket being shown in sectiona view to disclose the latching mechanism which engages the stopmotion lever.

Similar reference-figures refer to similar parts in the different views.

My invention is represented in the accompanying drawings as applied to a radial drillpress, although it may be applied to other types of drilhpresses, and it relates to that part of the mechanism which is employed in im arting a longitudinal movement to the dri l-spindle, whereby the drill is carried toward or away from the work with a quick motion or automatically fed during the operation of drilling or tapping, said mechanism being usually known as the feeding mechanism of the drill-press.

My invention also relates to the mechanism whereby the feedingmechanism of the drill is automatically arrested at a predetermined point, constituting what is known as the stop-motion.

The objects of my invention are to increase the efliciency of a drill-press by the introduction of new and improved means for accomplishing and controlling the feeding motion of the drill-spindle and also to provide an improved stop-motion.

The novel construction and arrangement of those parts which embody my invention are hereinafter described, and set forth in the annexed claims.

Referring to Fig. 1 of the accompanying drawings, I denotes the upright post of a drillpress, and 2 the radial arm,adjustably held on the post and carrying the vertical drillspindle 3, journaled in the usual manner in a quill or sleeve 4, which. is held between collars 5 and 6 on the drill-spindle and is capable of sliding i'nbearings 7, by which a longitudinal movement is given to the drill-spindle. The drill-spindle is rotated by means of connected driving mechanism, such as is commonly employed in drillpresses of this class, but which forms no part of my present invention, and is therefor not shown. in detail in the drawings, as its contruction and operation will be readily understood by those familiar with the ordinary drill-presses now in use. The longitudinal feeding motion of the drill-spindle is accomplished by means of a rack 8, attached to the sliding sleeve 4 and engaged by a pinion 9 on a pinion-shaft 1.0. Turning loosely onthe pinion-shaft 10 is a worm-gear 1 1, which is connected at will with. the inion-shaft by a clutching mechanism, hereinafter described. The worm-gear 1.1. is engaged by a worm 12, attached to a shaft 13, which I term the worm-gear shaft, which is journaled in a bearing 14 and carries at its lower end a hand-wheel 15. The wormgear shaft 13 is rotated by a feed-shaft 16, having its aXis in alinement with the axis of the worm-gear shaft 13 and connected thereto at will by means of a clutching mechanism 17, constructed as hereinafter described. The feed-shaft 16 is conveniently driven di rectly from the spindle by suitable intermediate mechanism in the usual and well-known manner in drill-presses of this class. The employment of a rotating drill-spindle carried in. a longitudinally-sliding sleeve or quill operatively connected with a rotating feeding-shaft parallel with the drill-spindle and driven therefrom is common in machines of this class, and such a construction was,

shown in United States Patent to A. Mill, dated March 24, 1896, No. 557,004, and I do not claim such broadly. My present invention relates particularly to the construction and arrangement of the intervening mechanism between the drill-spindle and the feedshaft, whereby the drill-press is capable of certain operations by which the efliciency of the machine is materially increased, as hereinafter described.

The clutching mechanism, by which the feed-shaft 16 is operatively connected with the Worm-shaft 13, consists of that type of friction-clutch known as a roller-clutch, in which friction rolls or balls are wedged between the opposing surfaces of the clutching members so that the motion of the one member is communicated to the other. ing member of the clutching mechanism consists of a polygonal disk 18, attached to the feed-shaft l6, and the driven member of the clutch consists of a cup-shaped shell or case 19, formed on the end of a sleeve 20, which is attached to the worm-gear shaft 13 and is provided with a flange 21, inclosing the polygonal disk 18. Between the sides 22 of the polygonal disk 18 and the inner surface of the flange 21 are rolls 23, which are loose when held in the widest portion of the space. 24 between the disk 18 and flange 21; but they are capable of being pinched or wedged tightly between the sides of the disk and the flange when they are slightly moved in either direction toward the narrower parts of the space. Between the rolls 23 are fingers 25, which hold the rolls from approaching each other. The fingers 25 project from a flange 26 on a sleeve 27, which incloses and is capable of sliding upon a collar 28, attached to the feed shaft 16. The sleeve 27 is provided with a peripheral groove 29 to receive the prongs of a shipping-lever 30, pivoted at 31 to the framework. The collar 28 is provided on its outer surface with grooves 32 32, which are placed obliquely to its aXis and are adapted toreceive the tips of screws 33, held in the sleeve 27, so that as the sleeve 27 is raised or lowered by means of the shipping-lever a slight rotary motion will be given to the sleeve 27 and fingers 25 independently of the rotary motion of the feed-shaft 16. Then the sleeve 27 is in its highest position, the fingers 25 hold the rolls 23 in the widest part of the space 24 or at the center of the sides 22 of the disk 18, so that the disk 18,flngers 25, and rolls 23 may rotate without imparting a rotary motion to the flange 21 but when the sleeve 27 is lowered by means of the shippinglever 30 it will be slightly rotated by the sliding of the screws 33 in the oblique grooves 32, causing the fingers 25 to crowd the rolls23 from their position at the center of the sides 22 toward the narrower part of the space 24, so that the wedging action of the rolls between the sides of the disk 18 and the flange 21 will cause the rotary motion of the feedshaft 16 -to be imparted to the worm-gear shaft 13. The rotation of the worm-gear shaft 13 by means of the hand-wheel 15 in the same direction, but at a higher rate of speed, will, however, cause the flange 21 to roll over the rolls 23, and thereby allow'the The drivworm-shaft 13 to be rotated by the handwheel 15 in advance of the rotation of the feed-shaft 16. This is a great advantage in the manipulation of the drill-press, for it allows the feed-shaft to be operatively connected with the worm-shaft in order to feed the drill-spindle during the operation of drilling or tapping and at the same time permit the feeding motion of the drill-spindle to be accelerated When necessary in order to carry the tool to the work.

The worm 12 engages the worm-gear 11, which is capable of turning loosely upon the pinion-shaft 10, but is connected at will with the pinion-shaft by means of a clutching mechanism which consists of a flange 34 on the side of the worm, inclosing an expansible ring 35, having one of its ends abutting a radial rib 36 on the side of a disk 37, which is keyed to the pinion-shaft 10. The radial rib 36 is provided with ways for a radially-sliding ring-expanding pin 38, having its outer end 38 bearing against one end of the expansible ring 35, so that the outer movement of the ring-expanding pin will crowd the ring outward into frictional contact with the flange 34 of the worm-gear 11. The inner end of the ring-expanding pin 38 is beveled and is in contact with a similarly-beveled end of a sliding pin 39, held concentrically in the pinion-shaft 10. The outer end of the sliding pin 39 carries a roll 40 in contact with the cam-surface 41 of a lever-handle 42, pivoted at its central portion at 43 between lugs 44 on a hub 45, which is attached to the end of the pinion-shaft 10 by screws 46 46. When the lever-handle 42 stands at right angles to the axis of the pinion-shaft 10, the expansible ring 35 is in its normal or contracted position and the worm-gear 11 is disconnected from the pinion-shaft 10; but by slightly rocking the lever-handle on its pivot the cam-surface 41 crowds the sliding pin 39 against the beveled end of the expanding-pin 38, which is forced out, causing the expansible ring 35 to engage the flange 34 of the worm-gear 1 1 and operatively connect the worm-gear with the pinion-shaft. nection with the pinion-shaft 10 enables the pinion shaft to be independently rotated when the worm-gear 11 is disengaged, and it also serves to actuate the clutching mechanism between the worm-gear and the pinion shaft.

The shipping-lever 30 is pivoted to the framework of the machine at 31 and extends beyond the sleeve or quill 4 and into the path of a stud 47, adjustably held in a slot 48 in the sleeve or quill 4, so that the downward movement of the sleeve or quill 4 will bring the stud 47 into contact with the shippinglever 30, causing the sleeve 27 to be raised on the obliquely-grooved collar 28, thereby disengaging the clutching mechanism between the feed-shaft 16 and the worm-gear shaft 13 The lever-handle 42 byits conand stopping the feeding motion of the drillspindle. When the drillspindle is again raised and the stud 47 carried out of contact with the shipping-lever 30, the motion of the shipping-lever is reversed by means of a spring 49 pressing against the under side of the shipping-lever and causing the clutching mechanism between the feed-shaft 16 and worm-gear shaft 13 to be again thrown into engagement. When it is desired to hold the sleeve 27 in an elevated position, with the feed-shaft 16 permanently disengaged from the worm-gear shaft 13, the shipping-lever 30 is still further depressed until it is brought into engagement with a latching mechanism supported in a fixed bracket 50, by which the shipping-lever 30 is held permanently depressed. The latching mechanism held in the fixed bracket 50 is represented. in Fig. 8 and consists ofa ball 51, held in a socket in the fixed bracket 50 and arranged to enter a recess 52 in the side of the shipping-lever 30. Pressing against the ball 51 is a spiral spring 53, whose pressure is received by a screwthreaded plug 54, forming a spring-actuated latch, by which the shipping-lever 30 is engaged and held from being raised by the action of the spring 49. The latch of the shipping-lever is placed below the limit of the downward movement of the shipping-lever as it is moved by the adjustable stud. 4.7, so that the stopping of the drill-spindle is accomplished without latching the shippinglever, the shipping-lever becoming -latched only when lowered by hand into contact with the fixed bracket 50, which brings the recess 52 into registration with the latching mechanism.

The clutching mechanism between the feed-shaft 16 and the worm-gear shaft 13 belongs to that class known as roller-clutches and in its main details of construction is not new but I employ it in that part of the feed ing mechanism which permits a rapid handfeed of the drill-spindle without disconnecting the drill-spindle from the power-feed, and I control the clutch by a sliding movement of the sleeve 27, parallel with the axis of the feed-shaft. A clutch comprising a friction-ring which is expanded by a sliding pin held concentrically in the shaft has heretofore been employed. in the feeding mechanism of a drill-press; but the use of a lever-handle operatively connected with the shaft and also with the concentric sliding pin is believed to be broadly new.

What I claim as my invention, and desire to secure by Letters Patent, is

1. In the feeding mechanism of a drillpress, the combination with a pinion-shaft by which the drill-spindle is raised or lowered, a hub on the end of said pinion-shaft, means for rotating said shaft and comprising a clutching mechanism, a lever-handle pivotally connected at its center to said hub and diametrically to its axis, and. a cam-surface on said lever-handle, by which said clutching mechanism is engaged or disengaged by the rocking of said handle on its pivot.

2. The combination with the pinion-shaft of a drill-spindle-feeding mechanism, of a worm-gear turning loosely on said shaft and. provided with a friction-flange, an expansible ring inclosed in. said flange, a disk attached to said shaft and carrying said expansible ring, a radially-sliding ring-expanding pin, a sliding pin held concentrically in said shaft, a hub on the end of said shaft, a lever handle pivoted at its central section to said hub and provided with a cam-surface engaging the end of said sliding pin, whereby said pin is moved in said shaft.

3. The combination in the feeding mechanism of a drill-press, of a pair of shafts with their axes in alinement, a clutching mechanism connecting the opposing ends of said shafts and comprising a series of rolls ar ranged to be wedged between the driving and driven members of said clutch, fingers inserted between said. rolls, a sleeve concentric with the axis of the clutch and carrying said fingers, means for sliding said sleeve parallel with the axis of the clutch, means for rotating said sleeve during its sliding movement, substantially as described.

4. In the feeding mechanism of a drillpress, the combination of shafts 16 and 13, a roller-clutch connecting said shafts, a collar on one of said shafts provided with oblique grooves, a sleeve capable of sliding 011 said collar and engaging said oblique grooves, whereby a slight rotary movement is given to said sleeve during its sliding movement, fingers carried by said sleeve and extending between the rolls of said roller-clutch, substantially as described.

5. In the feeding mechanism of a drill press, the combination of shafts 16 and 13, a clutching mechanism connecting said shafts and comprising driving and driven members and a series of wedging-rolls, of fingers extending between said rolls, a sliding sleeve concentric with one of said shafts and carrying said lingers, oblique grooves engaged by said sleeve, a pivoted shipping-lever engaging said sleeve and means controlled by the movement of the drill-spindle for rocking said lever, whereby said clutch is disengaged, substantially as described.

Dated this 7th day of March, 1901.

ALBERT E. NEWTON.

Witnesses:

RUrUs B. FOWLER, FLORENCE C. Coon IIS 

